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関連する概念動画

Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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ATP and Macromolecule Synthesis01:28

ATP and Macromolecule Synthesis

6.7K
Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
6.7K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.2K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
4.2K
Polymers02:34

Polymers

39.8K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
39.8K
Polymers02:34

Polymers

23.0K
23.0K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.7K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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関連する実験動画

Updated: Dec 11, 2025

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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モノディスパース マクロモレキュル セルフ・インタープット・リビング・ポリメリゼーション

Marian N Holerca1, Mihai Peterca1, Benjamin E Partridge1

  • 1Roy & Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States.

Journal of the American Chemical Society
|August 21, 2020
PubMed
まとめ

研究者は,自己中断型生体ポリメリゼーションを用いた単分散合成マクロモレキュルの合成のための新しい方法を開発しました. この画期的な発見は 統一されたポリマーを作るための より効率的な方法を提供し 現在の技術の限界を克服します

さらに関連する動画

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

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関連する実験動画

Last Updated: Dec 11, 2025

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

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科学分野:

  • マクロ分子化学
  • 超分子化学
  • ポリマー科学

背景:

  • タンパク質や核酸のような生物学的マクロモレキュルは自然に単分散である.
  • 合成ポリマーは通常,鎖の長さの混合物として存在し,その均一性を制限します.
  • モノディスパース合成ポリマーを製造するための既存の方法は,しばしば非効率で低生産性です.

研究 の 目的:

  • 単分散合成マクロモレキュルを合成するための新しい方法論を開発する.
  • 高分子均一性を達成するために,従来のポリメリゼーション技術の限界を克服する.
  • 超分子化学とマクロ分子化学の原理を組み合わせた新しいアプローチを導入する.

主な方法:

  • 自己中断型生体ポリメリゼーション技術を使った
  • 超分子化学とマクロ分子化学の統合された概念
  • 伝統的なポリマー合成の反応性原理から逸脱する方法を考案した.

主要な成果:

  • 単分散合成マクロモレキュルを 合成した
  • 標準的な方法では以前は達成できなかったレベルの均一性を達成しました.
  • 従来のアプローチとは異なる新しいポリメリゼーション戦略を示した.

結論:

  • 自己中断型生体ポリメリゼーションは,合成マクロモレキュルの単分散に有効な経路を提供します.
  • この新しい方法論は,従来のポリマー合成を超えて重要な進歩を表しています.
  • 超分子化学とマクロ分子化学の組み合わせは ポリマー設計の新たな道を開きます